Lost L. Lake
Thunder Bay District, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Lost L. Lake. Here is what has been measured.
- 44 ft max depth
Lost L. Lake in Thunder Bay District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 1.7 m visibility. Phosphorus: 9.1 µg/L.
Stays via Stay22
Stays near Lost L. Lake
Compare lakeside cabins, hotels, and vacation rentals near Lost L. Lake in Thunder Bay District, Ontario — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lost L. Lake
Prices for Sep 18–20, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Lost L. Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Lost L. Lake is a lake in Thunder Bay District County, Ontario with an estimated average depth of about 44 feet.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-08-01. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lost L. Lake is safe to swim in today is a call for the Ontario Ministry of the Environment, Conservation and Parks and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lost L. Lake
These are the measurements Ontario MECP publishes for Lost L. Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.6 ft. Phosphorus 9.1 µg/L. TSI 44.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 m | Measured, not scored |
| Phosphorus | 9.1 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~13.4 m est. |
| Average Depth | ~5.2 m est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Ontario has not published bathymetry for Lost L. Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Lost L. Lake
Nearby Lakes in Thunder Bay District
Frequently asked questions about Lost L. Lake
Ask about Lost L. Lake
Answers come straight from the public measurements and survey records on this page.
Where is Lost L. Lake?
- Lost L. Lake is a lake in Thunder Bay District, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Lost L. Lake?
- Lost L. Lake in Thunder Bay District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 1.7 m visibility. Phosphorus: 9.1 µg/L.
Is Lost L. Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lost L. Lake?
- No published bathymetric survey covers Lost L. Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 44 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Lost L. Lake across LakeQuality
More lakes in Ontario
Other Lakes in Ontario
Mesotrophic Lakes in Ontario
Where this data comes from
Measurements for Lost L. Lake come from Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring), not the EPA Water Quality Portal. Per-sample source details are not recorded for this lake. Contains information licensed under the Open Government Licence – Ontario. See data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)